40511661 has 4 divisors (see below), whose sum is σ = 54015552. Its totient is φ = 27007772.

The previous prime is 40511657. The next prime is 40511687. The reversal of 40511661 is 16611504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40511661 - 2² = 40511657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40511621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6751941 + ... + 6751946.

It is an arithmetic number, because the mean of its divisors is an integer number (13503888).

Almost surely, 2^40511661 is an apocalyptic number.

It is an amenable number.

40511661 is a deficient number, since it is larger than the sum of its proper divisors (13503891).

40511661 is a wasteful number, since it uses less digits than its factorization.

40511661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13503890.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 40511661 is about 6364.8771394270. The cubic root of 40511661 is about 343.4472288940.

The spelling of 40511661 in words is "forty million, five hundred eleven thousand, six hundred sixty-one".